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Structural formulas of purine and pyrimidine nitrogenous bases of DNA and RNA, illustration, vector, isolated on white

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This diagram was created in ConceptDraw PRO using the Aromatics Library from the Chemistry Solution. An experienced user spent 5 minutes creating this sample. This sample shows the structural formulas of PAH (polycyclic aromatic hydrocarbons) compounds, which contain organic molecules of carbon and hydrogen and are composed of multiple aromatic rings.

The basic building block of DNA is called a NUCLEOTIDE. A nucleotide is made up of one sugar molecule, one phosphate molecule and one of the four bases. Here is the structural formula for the four nucleotides of DNA. Note that the purine bases (adenine and guanine) have a double ring structure while the pyrimidine bases (thymine and cytosine) have only a single ring. This was important to Watson and Crick because it helped them figure out how the double helix was formed.

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LEVAQUIN® (levofloxacin) Structural Formula Illustration "Community-Acquired Pneumonia: 5-Day Treatment Regimen LEVAQUIN® is indicated for the treatment of community-acquired pneumonia due to Streptococcus pneumoniae (excluding multi-drug-resistant isolates [MDRSP]), Haemophilus influenzae, Haemophilus parainfluenzae, Mycoplasma pneumoniae, or Chlamydophila pneumoniae [see DOSAGE AND ADMINISTRATION and Clinical Studies]."

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